of his resources, which he renders ineffectual and sterile. Nay, whoever bestows his attention on these points, rather than on the delineation of the living figure, will frequently derive from his efforts a dry and angular hardness of manner, which is a very common result of too close a consideration of minute points. There is, moreover, the highest probability that one so disposed will become unsocial, melancholy, and poor, as did Paolo Uccello, who, being endowed by nature with a subtle and inquiring spirit, knew no greater pleasure than that of undertaking over-difficult, or, rather, impossible problems of perspective; which, although, doubtless curious,, and perhaps beautiful, yet so effectually impeded his progress in the more essential study of the figure, that his works became worse and worse, in that respect, the older he grew. It is by no means to be denied that the man who subjects himself to studies too severe, does violence to his nature; and, although he may sharpen his intellect on one point, yet, whatever he does, wants the grace and facility natural to those who, proceeding temperately, preserve the calmness of their intelligence, and the force of their judgment, keeping all things in their proper place, and avoiding those subtletieswhich rarely produce any better effect than that of imparting a laboured, dry, and ungraceful character to the production, whatever it may be, which is better calculated to move the spectator to pity, than awaken his admiration. It is only when the spirit of inspiration is roused, when the intellect demands to be in action, that effectual labour is secured; then only are thoughts worthy of expression conceived, and things great, excellent, and sublime accomplished. Paolo Uccello employed himself perpetually, and without any intermission whatever, in the consideration of the most difficult questions connected with art, insomuch that ho brought the method of preparing the plans and elevations of buildings, by the study of linear perspective, to perfection. From the ground plan to the cornices, and summit of the roof, he reduced all to strict rules, by the convergence of intersecting lines, which he diminished towards the centre, after having fixed the point of view higher or lower, as seemed good to him: he laboured, in short, so earnestly in these difficult matters, that he found means, and fixed rules, for making his figures really to seem standing on the plane whereon they